BushMaster-15
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Some Good Solid Information pertaining to 7mm Rem Mag. Velocities bullets weights design paper punchers to Moose stoppers and at what yardages they're effective at .
https://www.ballisticstudies.com/Knowledgebase/7mm+Remington+Magnum.html
Below is but a smidgen of published information .
The most suitable powders for reloading the 7mm RM are the slow burn rates IMR4831/H4831sc/N165/RL22 through to H1000/RL25. Hodgdon Retumbo (ADI2225) is a little too slow in most instances. Brass for the 7mm RM is readily available throughout the world and is produced by several manufacturers.
Hand loaded for a 24” barrel, maximum safe working velocities include 3250fps with 140 grain bullets, 3150fps with 150 grain bullets, 3100fps with 154 grain bullets, 3050fps with 160-162 grain bullets and 2900fps with 175 grain bullets and the 180 grain VLD.
From a 26” barrel, velocities include 3320fps with 140 grain bullets, 3220fps with 150 grain bullets, 3120fps with 160-162 grain bullets and 2950fps with 175-180 grain bullets. As always and regardless of barrel length, individual rifles will show preferences, some producing best accuracy at higher pressures, other rifles producing optimum accuracy with low pressure charges. As an example, some rifles will shoot the 162 grain bullets with optimum accuracy at an MV of 3040fps, some will give best accuracy right at 3120fps, others will give best accuracy at both pressure levels (sweet spots), producing relatively poor groups with intermediate charges. Experimentation is the key.
For dedicated long range hunters, best velocities are achieved with 28-30” barrels capable of pushing the 162 grain A-Max at 3200fps and the 180 grain VLD at 3000-3050fps. Optimum twist rate for all bullet weights in the 7mm RM is 1:9”.
Accuracy is of vital importance when working up a 7mm magnum load. Any gain in velocity over a standard cartridge will immediately be negated if the rifle will not shoot better than these cartridges at the extended ranges for which magnums excel at. This applies not only to long range hunters but also to the hunter who expects clean killing at 300 yards. Poorly bedded rifles or rifles set up with unreliable optics produce abysmal results in the field, slow killing gut shots being the most common result.
As with most belted magnums, neck dies usually produce better accuracy than full length resizing dies. The only exceptions to this general rule are when reloading for rifles with minimum head space as well as semi auto rifles and unique action designs such as the Blaser rifle system. Not only do neck dies aid accuracy, but are also much quicker and cleaner to use than FL dies.
Not a fan of the 7mm ,Not to worry lookup YOUR Favorite cartridge : Fyi , I also like .224, 6.5, .30 and .38 calibers as well as
https://www.ballisticstudies.com/Knowledgebase.html
https://www.ballisticstudies.com/Knowledgebase/7mm+Remington+Magnum.html
Below is but a smidgen of published information .
Hand Loading
The most suitable powders for reloading the 7mm RM are the slow burn rates IMR4831/H4831sc/N165/RL22 through to H1000/RL25. Hodgdon Retumbo (ADI2225) is a little too slow in most instances. Brass for the 7mm RM is readily available throughout the world and is produced by several manufacturers.
Hand loaded for a 24” barrel, maximum safe working velocities include 3250fps with 140 grain bullets, 3150fps with 150 grain bullets, 3100fps with 154 grain bullets, 3050fps with 160-162 grain bullets and 2900fps with 175 grain bullets and the 180 grain VLD.
From a 26” barrel, velocities include 3320fps with 140 grain bullets, 3220fps with 150 grain bullets, 3120fps with 160-162 grain bullets and 2950fps with 175-180 grain bullets. As always and regardless of barrel length, individual rifles will show preferences, some producing best accuracy at higher pressures, other rifles producing optimum accuracy with low pressure charges. As an example, some rifles will shoot the 162 grain bullets with optimum accuracy at an MV of 3040fps, some will give best accuracy right at 3120fps, others will give best accuracy at both pressure levels (sweet spots), producing relatively poor groups with intermediate charges. Experimentation is the key.
For dedicated long range hunters, best velocities are achieved with 28-30” barrels capable of pushing the 162 grain A-Max at 3200fps and the 180 grain VLD at 3000-3050fps. Optimum twist rate for all bullet weights in the 7mm RM is 1:9”.
Accuracy is of vital importance when working up a 7mm magnum load. Any gain in velocity over a standard cartridge will immediately be negated if the rifle will not shoot better than these cartridges at the extended ranges for which magnums excel at. This applies not only to long range hunters but also to the hunter who expects clean killing at 300 yards. Poorly bedded rifles or rifles set up with unreliable optics produce abysmal results in the field, slow killing gut shots being the most common result.
As with most belted magnums, neck dies usually produce better accuracy than full length resizing dies. The only exceptions to this general rule are when reloading for rifles with minimum head space as well as semi auto rifles and unique action designs such as the Blaser rifle system. Not only do neck dies aid accuracy, but are also much quicker and cleaner to use than FL dies.
Not a fan of the 7mm ,Not to worry lookup YOUR Favorite cartridge : Fyi , I also like .224, 6.5, .30 and .38 calibers as well as
https://www.ballisticstudies.com/Knowledgebase.html
